Historical seismicity shows the presence of mega-thrust segments along the Sumatran subduction zone that could generate large earthquakes. The segments include the Aceh-Andaman, Nias-Seumeuleu, Batu, Siberut, Mentawai-Pagai, Enggano, and Sunda Strait. Shallow and large earthquakes with magnitudes larger than 7.5 can occur along the segments thus trigger tsunamis. The accurate seismicity distribution along the subduction zone can be used to characterize the segments. The objective of the research is to precisely relocate the earthquakes in order to investigate the properties of the Sumatran subduction zone. Among more than 5000 preliminary located earthquakes occurring in 1980-2018 obtained from the Indonesian Agency for Geophysics (BMKG), only earthquakes with azimuthal gap angle less than 180 and recorded by at least 4 stations are used in the data analysis. We applied double difference method in order to relocate the seismic events. The result shows a zone with significantly less earthquakes along the subduction in West Aceh interpreted as a seismic gap zone. This zone is expected to accumulate energy which could be released in the form of a large earthquake. The new earthquake locations mimic shallower Sumatran subduction zone further north therefore closer to people inland. The closer earthquake the higher intensity of an earthquake felt by people which higher level of hazard. The pattern of the subduction zone derived from the relocated seismicity can be used as better source information for tsunami modeling.

历史地震活动表明苏门答腊俯冲带沿线存在可能产生大地震的巨型逆冲断层。这些部分包括亚齐-安达曼、尼亚斯-Seumeuleu、巴图、西比鲁、明打威-帕盖、恩加诺和巽他海峡。沿路段可能发生震级大于 7.5 的浅层和大地震，从而引发海啸。沿俯冲带的准确地震活动分布可用于表征这些段。该研究的目的是精确地重新定位地震，以研究苏门答腊俯冲带的特性。在从印度尼西亚地球物理局 (BMKG) 获得的 1980-2018 年发生的 5000 多次初步定位的地震中，数据分析仅使用方位间隙角小于 180 度且至少有 4 个台站记录的地震。我们应用双差法来重新定位地震事件。结果表明，西亚齐俯冲沿线地震明显较少的区域被解释为地震间隙区。预计该区域将积累能量，这些能量可能以大地震的形式释放。新的地震地点模拟了更北的较浅的苏门答腊俯冲带，因此更靠近内陆的人们。地震越近，人们感受到的地震强度越高，危害程度越高。从重新定位的地震活动中得出的俯冲带模式可以用作海啸建模的更好源信息。我们应用双差法来重新定位地震事件。结果表明，西亚齐俯冲沿线地震明显较少的区域被解释为地震间隙区。预计该区域将积累能量，这些能量可能以大地震的形式释放。新的地震地点模拟了更北的较浅的苏门答腊俯冲带，因此更靠近内陆的人们。地震越近，人们感受到的地震强度越高，危害程度越高。从重新定位的地震活动中得出的俯冲带模式可以用作海啸建模的更好源信息。我们应用双差法来重新定位地震事件。结果表明，西亚齐俯冲沿线地震明显较少的区域被解释为地震间隙区。预计该区域将积累能量，这些能量可能以大地震的形式释放。新的地震地点模拟了更北的较浅的苏门答腊俯冲带，因此更靠近内陆的人们。地震越近，人们感受到的地震强度越高，危害程度越高。从重新定位的地震活动中得出的俯冲带模式可以用作海啸建模的更好源信息。预计该区域将积累能量，这些能量可能以大地震的形式释放。新的地震地点模拟了更北的较浅的苏门答腊俯冲带，因此更靠近内陆的人们。地震越近，人们感受到的地震强度越高，危害程度越高。从重新定位的地震活动中得出的俯冲带模式可以用作海啸建模的更好源信息。预计该区域将积累能量，这些能量可能以大地震的形式释放。新的地震地点模拟了更北的较浅的苏门答腊俯冲带，因此更靠近内陆的人们。地震越近，人们感受到的地震强度越高，危害程度越高。从重新定位的地震活动中得出的俯冲带模式可以用作海啸建模的更好源信息。